Diff project | FerrariChat

Diff project

Discussion in 'Boxers/TR/M' started by tuplakoo, Feb 19, 2021.

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  1. tuplakoo

    tuplakoo Rookie

    Aug 25, 2017
    43
    Finland
    Full Name:
    Kari Kovanen
    #1 tuplakoo, Feb 19, 2021
    Last edited: Feb 19, 2021
    Few weeks ago I bought new afrer market differential to my 512tr and started to plan who or how to do the change.
    Friend of mine has done it several times and he promised to advice me enough to do it with my son and come to do measurement/ adjusting job when its ready for it.

    Today was the day to to take out the old diff and start to assemble the new one. My friend made some measurements, took side covers off and same time old diff went in two pieces, it was already broken !!!
    Everything else around diff looks to be ok, but big bang was close, really close!!!
     
    lagunacc and George Vosburgh like this.
  2. Zeff

    Zeff Formula Junior

    Oct 8, 2018
    678
    Cupertino, Ca
    Full Name:
    Ryan
    Curious, how many miles are on your car? What year is it?
     
  3. bamaman

    bamaman Formula Junior

    Nov 27, 2015
    638
    Mobile Alabama
    Full Name:
    William M (B.J.) Lyon, Jr.
    Wow, good and bad luck--what was the cause?
     
    tuplakoo likes this.
  4. mexicruiser

    mexicruiser Karting

    Aug 28, 2012
    241
    Full Name:
    Jon
    Very lucky guy!
    I just did this thing to my boxer, so everything still fresh for me, although my diff was still ok.
    Preload setting is the tricky part lots of opinions (I have my own)
    Be sure to get new crown bolts (I used ARP) these are not reusable.
    Take pics of diff internals When disassembling, there is a right way to get the proper bias from the LS.
     
    BSMMelb likes this.
  5. JohnMH

    JohnMH Formula 3

    Jan 28, 2004
    1,625
    Dubai / Bologna
    I am going to replace the diff on my 91 this summer when the engine is out for new belts I have already secured the billet case and new LS disks. Any tips or suggestions would be of great assistance.
     
    tuplakoo likes this.
  6. tuplakoo

    tuplakoo Rookie

    Aug 25, 2017
    43
    Finland
    Full Name:
    Kari Kovanen
    Its -92 and 40k miles / 65k km
     
    Zeff likes this.
  7. tuplakoo

    tuplakoo Rookie

    Aug 25, 2017
    43
    Finland
    Full Name:
    Kari Kovanen
  8. tuplakoo

    tuplakoo Rookie

    Aug 25, 2017
    43
    Finland
    Full Name:
    Kari Kovanen
    Do you have a part no. for ARP crown bolts ?
    (couldnt find them at ARP site)

    My new diff is complete with inserts,
    and ready to bolt on.
     
  9. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,868
    southwest germany and thailand
    Full Name:
    romano schwabel
    you are very kucky that the left side cover was not broken
    and also no more damage happened

    so again:
    it is not a question IF the diff will break - only WHEN
     
    Zeff, tuplakoo and Grease Donkey like this.
  10. mexicruiser

    mexicruiser Karting

    Aug 28, 2012
    241
    Full Name:
    Jon
    tuplakoo likes this.
  11. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,041
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Adding the F PN for future searches (and the ARP Part #):

    Ferrari PN: 104310 Crown gear securing screw
    ARP Part #100-9908
     
    tuplakoo likes this.
  12. TerryG!

    TerryG! Karting

    Feb 12, 2017
    155
    Central UK
    tuplakoo, where did you buy your aftermarket diff please?
    I’m in the UK and saw adverts for a replacement diff a couple of years ago - which I now cannot find.
    I do see that Superformance offer a unit priced at £2250 plus tax.
     
  13. TerryG!

    TerryG! Karting

    Feb 12, 2017
    155
    Central UK
    OK - 10 mins after posting the above I found what I was looking for. It was Gripper that I looked at previously.
     
  14. tuplakoo

    tuplakoo Rookie

    Aug 25, 2017
    43
    Finland
    Full Name:
    Kari Kovanen
    Yes, I bought mine from Gripper
     
  15. TerryG!

    TerryG! Karting

    Feb 12, 2017
    155
    Central UK
    Hope the fit goes well. I look forward to news of your success.
     
  16. MOSS

    MOSS Formula 3

    Apr 28, 2004
    1,619
    I understand that it happens. The question is why. Owning 4 Tr cars and one being a 750 hp car, it points to mechanical abuse. Its not a 2005 mustang that you can hammer. If you or the former owners would have treated the car like it should have been then this would not have happened. Brute strength carriers are made but not required for a guy that understands what is happening back there.
     
  17. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,041
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #17 Steve Magnusson, Feb 21, 2021
    Last edited: Feb 21, 2021
    Misread the ARP PN from the pic -- should've written:
    Ferrari PN: 104310 Crown gear securing screw
    ARP Part #203-2802 (but the pic is not so clear for this so hope someone can better confirm)
     
  18. MOSS

    MOSS Formula 3

    Apr 28, 2004
    1,619
    Owners need to take care of their cars. Sometimes you are a victim of the previous owner. i get that. You do not deserve to own a TR if you do not understand what you own. You can tear it up by abuse that you may not even understand. There are delicate areas of these cars unlike other cars. Someone needs to post a do not thread about TR’s. I may if another does not get it and can step in.
     
    Stefan328gts and Gary Sandberg like this.
  19. MOSS

    MOSS Formula 3

    Apr 28, 2004
    1,619
    If Steve had the time or thinks it is warranted to help others in the future that buy their first or second TR to save them some money and heartache, maybe he coul start a do's and do not thread for taking care of these cars. Steve I will pm you about this. I understand that some may disagree with me but I am just trying to help others so they don't see this problem occur. Plenty of high mileage cars out there that have never touched the differential and I don't think they just lucked out and got a better one than the next car. These cars just have a light duty case and couple that with a heavy car and jack rabbit takeoffs and jerking the car through the gears start the crack process on the casing at the welds. If none of this matters to you then just money up and get the Newman piece so you can hammer the car around without worry....at least in the casing. I have seen broken teeth on 2nd gear and so many abuse related problems. Ferrari's and Lamborghini's are mainly cruise/track cars and not meant for the drag strip or related.
     
    peteficarra and Gary Sandberg like this.
  20. mikael82

    mikael82 Formula Junior

    Nov 18, 2007
    869
    Finland
    Full Name:
    Mikael
    I am the friend he is refering, this is my fourth car I am chaging diff, Owner does bolting, but I help and offer tools and take messurments/coloring.

    I currently runing out of peelable shimms and have try to contact "Forza Components" to get more, but no luck. Does anyone have information about Phil or other option for those great peelable shimms.
     
  21. raysur

    raysur Formula Junior
    Silver Subscribed

    May 3, 2008
    561
    So. Cal.
    Full Name:
    Jeff
    When I used the Forza peelable shim I needed to open up a couple of holes before using. Did you have this issue?

    Because of this I'd rather just have a new one cut. You can spec out the thickness of the peel too. Turbo Joe posted the vector artwork for the shim. I'll check my files for it. His file had the holes laid out correctly.
     
    turbo-joe likes this.
  22. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,868
    southwest germany and thailand
    Full Name:
    romano schwabel
    just now again in thailand and have no access to me documents in germany
    but you may find somewhere here for sure
     
  23. raysur

    raysur Formula Junior
    Silver Subscribed

    May 3, 2008
    561
    So. Cal.
    Full Name:
    Jeff
    Found it. Romano, thank you for making this.
     

    Attached Files:

  24. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,868
    southwest germany and thailand
    Full Name:
    romano schwabel
    I had to made it because have laser cutted a few shims
    so why not share then with you all
     
  25. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    3,373
    Ferrari chose a crappy design when they put a weld in that location. Abuse makes it obvious, but the bad Ferrari design is still the root cause (pun intended) of these failures.
     

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